US1763946A - Feeding mechanism for sewing machines - Google Patents

Description

June 17, 193i).- J. BERGER l A FEEDING-,MECHANISM FOR SEWING MACHINES Filed Nov'. 9, 192e :s sheets-sheet 1 June 17, 1930. J. BERGER 1,763,946

FEEDING MECHANISM FOR SEWING MACHINES Filed Nov, 9, 192e 5 sheets-sheet 2 June 17, 1930. J, BERGER 1,763,946

FEEDING MECHANISM FOR SEWING MACHINES Filed Nov. 9, 1926 5 sheets-sheet 3 Patented June 17, 1930 J' OSEPH BERGER, OF UTGA, NEW YORK, ASSE-GHOR T0 'UNION SPECIAL' MAGHNE COM- PANY, OF CI-IIGAGO, ILLNOS, A COBPGRATEON OF ILLINOIS FEEDENG MECHANISM FOR SEWING MACHINES Application led November 9, 1926.

The invention relates to new and useful improv-ements in feeding mechanisms for sewing machines, and more particularly to a feeding mechanism including an upper feed dog and a presser foot which are alternately raised and lowered.

An object of the invention is to provide a feeding mechanism of the above type wherein the lever for alternately raising and low- 19 eringithe feed dog and presser foot is disposed in a plane at right angles to the line of feed, `and extends to a considerable distance away from its fulcrum point on the support for the presser foot, so that the up and down movements of the foot and dog incident to the increasing and decreasing thickness in the material, does not lift one of said members relative to` the other.

A further object of the invention is to pro- 20 vide a feeding mechanism of the above type wherein the lifting lever for the feed dog is connected thereto by a thrust rod and' lifting spring, so disposed that'thethrust rod serves as a fulcrum support Vfor the lever when the presser foot is lifted, and the spring serves as a means for'lifting the feed dog when the free end of the lever is raised.

A still further object of the invention is to provide a machine of the above type,

3o wherein the upper feed dog cooperates with the lower feed dog, and wherein said upper feed dog moves back and forth with very little lifting movement thereof.

A still further objectof the invention is to provide a feeding mechanism of the above type, wherein the presser foot is positively lifted from the material so as to permit the free feeding of the material with little or no drag thereon.

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 front view of a sewing machine embodying my improvements;

Fig. 2 isan end view of the machine, with parte thereof back from the 4head omitted; 5e 3 is a view, partly in section and about sharply curved portions.

Serial No. 147,263.

partly in plan, above the upper feed-dog supporting bar;

Fig. 4 is a detail view beneaththe vwork support showing the looper operating mech- -anism and a part of the feed actuating meches anism;

Fig. 5 is a view partly in sect-ion `and partly in perspective5 showing the means; for alternately lifting the presser foot'and upper feed dog;

Fig. 6 isa View partly in section anfd'` partly in sidel elevation of the head 'of themachine,`the presser foot supporting means, and the means for'alternately lifting the presser foot and upper feed dog; o5

The invention is directed broadly to "a feeding mechanism for sewing machines wherein there is an upper feed dog and a lower feed dog. The upper feed dogis relatively small, and is, in the present embodiment of the invention, smooth on its under face. Associated with this upperjfeed dog is-a presser vfoot which is located 'alongside of the feed dog, and which is verysmall, as the machine is particularly adapted for "'75 binding articles where a narrow binding is used, and wherein the binding may be placed The machine may also be used for sewing articles, like gloves, vwherein the line of stitches is laid close to the edge of the material and passes around sharply curved portions, and

' where the plies which are being stitched together, must be moved evenly so as to come out even at the end of the seam. The small presser foot strips the material from the needle as it moves upward, and is positively lifted'so as to put no drag upon the material as it is fed. The material is fed by the'cooperation of a lower and an upper feed dog. Means is provided for alternately raising and lowering the upper feed dog and the presser foot. `This means 'includes Valever which is pivotally mounted on the supporting means for the presser foot, and is vconnected lto the upper feed dog through atension rod and lifting spring. This lever is' located in a plane at right 'angl'e'sto'the line of feed,- and extends vto a considerable distance awa-y from itsfulcrbmpoitywhere lot .in adjusted positions.

the invention is shown as applied to a sewlng machine consisting of a supporting bed 1 carrying astandard'2, having an overhanging arm 3 provided with a needle head 4:,in which a needle bar 5 reciprocates. The needle bar 5 is reciprocated by means of a needle lever 6, pivoted at Y7 to the standard 2. The needle lever is oscillated by a pitman 8 cooperating with an eccentric 9 on the Ymain shaft 10. This main shaft is mounted in suitable bearings carried by the bed 1.V

Mounted on the standards carrying the bearings for the main shaft is a work support 11. The material is held on the work support by .a presser foot 12, which has a relatively small foot portion with a needle opening 13 therethrough. This presser foot 12 is carried by a shank 14 which is formed integral with a supporting head 15 fixed to the Alower end of the presserfbar 16 by a set screw 17.

. Located alongside of this presser foot 12 is an upper feed dog 18. This upper feed dog 18 is secured to the front end of a feed bar 19. The feed bar 19 is pivoted at 2O to a depending arm 21 which in turn is pivoted at 22 to a bracket 23 carried by a guide bar 24 which is associated with the presser bar 16. Mounted on the presser bar 16 just above the head 15-is a collar 25. This col- .lar 25 has a rearwardly extending arm 25a which is attached to the guide bar 24. Therefore, the guide bar will move up and down with the presser bar. This. up and down movement of the guide bar 24 raises and lowers the rear end of the feed bar 19. The feed bar 19 moves in a guiding slot `2b formed in the yhead 15. This slot merely guides the feed bar and prevents 'j lateral movement thereof. The feed bar is free to move both endwise and up and down in the slot.

A lever 27 is provided for alternately raising and lowering the feed dog and presser Vfoot'. The collar 25 is provided with a second arm 25h, and the lever 27 is mounted on this arm 251.V A fulcrum shaft 28 is mounted on the collar in the arm 25h, and

i the lever 27 is secured to this shaft by a set screw 29. The lever 27 has a forwardly eX- tending arm 30. Threaded through this arm 30 is a bolt 31. The headof the bolt is provided with a pocket or recess 32. A nut 33 is threaded on to the bolt and locksv the bolt A bracket member 34 is clamped to the lever by the nut- 33. The feed dog 18 is carried by a supporting block .35, and this block has a pocket or recess 36 therein. vA thrust rod 37 freely engages the pocket or recess k32 at its upper end, and the pocket or recess 36 at itsY lower end. A

Yspring V38 coiled about the thrust rod is link 39 to an arm 40 formed integral with the needle lever 6. As the needle lever 6 oscillates, it will swing the lever 27. When the lever is raised at the right-hand end thereof as viewed in Fig. 1, then the thrust rod 37 becomes a fulcrum support for the lever,'and the presser foot is lifted free of the material. On the other hand, when the right-hand end of the lever 27 is moved downward, the shaft 28 serves as a fulcrum for the lever, and they free end 30 of the lever is raised. 1

Tt will be noted that the distance between the connection of the link 39 to the lever eX- tension 27a and the fulcrum point 0f the lever, is very long, and therefore', the feed dog is only lifted a slight distance, so that the upper feed dog, while it is freed from the material, moves back and forth with comparatively little rising and falling movement. The presser foot, however, is positively lifted, and while it is only lifted to a small distance, it is lifted suiiciently far to free the material from all drag of the foot during the feeding thereof. The lower feed dog risesthrough the Work support Y movements imparted to the presser footand upper feed dog through the increasing or decreasing thickness of the material operated upon, does notdisturb the relative positionsof the upper feed dog and presser foot, for the reason Vthat the distance from the fulcrum of the lever to the operating link 39, is very long compared to the distance between the point of connection of the lever to the presser bar andthe lever to the feed dog. This distance is so long that the lever remains substantially horizontal for all thicknesses of material. Furthermore, by

placing the lever at right angles to the line of feed, it may be extended well under the arm to give this relatively long leverage, without unduly projecting from the machine.

ipeaeie The upperfeed dog 19 is moved back and forth by.a link 41 which is pivoted at 42 to .an .auxiliary arm 43 carried by the arm 21. This link 41 is pivotedat 44 to a depending arm 45 attached to a rock shaft 46. At the other end of therock shaft 46, there is a depending arm 47, and this depending arm .47 is connected by a link 48 to an arm 49 which is rigidly attached to a rock shaft 50. rThe arm 49 is in turn connected to link 51, and the link 51 is connected to an arm V52 having a segmental slot therein, and the connection between the link 51 and the arm 52 is adjustable in said, segmental slot. The arm 52 is in turn rigidly mounted on a rock shaft 53. Said rock shaft 53 carries a collar 54 carrying an arm 55. An eccentric strap 56 cooperating with an eccentric on the main shaft 10 is connected to a pin 57 iXedly mounted in the arm 55. As the main shaft 10 rotates, the eccentric strap 56 through the arm 55, will oscillate the rock shaft 53, and the rock shaft 53 through the arm 52 and link 51, will oscillate the rock shaft 50, and also oscillate the rock shaft 46. This causes the upper feed dog to move back and forth.

Cooperating with the upper feed dog 13 is the lower feed dog 5S. This lower feed dog 58 is adjustably mounted on a feed bar 59 which is substantially vertical. The feed bar 59 is pivoted at 60 to a lever 61. The lever 61 is pivoted at 62 to a lug fixed to the bed plate 1 of the machine. The rock shaft 60 carries an arm 63 which is connected by a link 64 to this main feed bar 59. As the rock shaft 50 is oscillated during the back and forth movements imparted to the upper feed dog, this arm 63 will swing the feed bar 59 on its pivotal support 60, and thus move the lower feed dog back and forth. The lower feed dog is raised and lowered by a pitnian 65 cooperating with an eccentric 66 on the main shaft 10, and connected to a pin 67 on the lever 61.

The needle bar 5 carries a needle 68 and cooperating with the needle 68 is a looper 69 which is fixed to a vert-ical shaft 70 mounted in a supporting bracket 71. Attached to the" looper support is an arm 72 and a link 73 connects said arm to a bell crank 74. The bell crank 74 is oscillated by a link 75 connected at 76 to the needle lever extension 77.

It is thought that the operation of my machine will be obvious from the above description. The machine is especially adapted for operating upon gloves or narrow binding strips or the like, wherein the line of stitching must pass about sharp curves. The material is held on the work support by the presser foot which is relatively small. This permits sharp curves to be turned, and the presser foot is positively raised so as to avoid any drag on the material. The upper feed dog is smooth on its under face in the preferred form of the'invention, although it might be provided with teeth,.if found desirable. vThe upper feed dog has a relatively small lift, and moves backk and forth in unison withthe lower feed dog. rThe upper feed dog and the presser' foot are alternately raised and lowered, and the presser foot is positively raised as ,above noted. .The upper feed dog is positively forced down against the material by the thrust rod, which also serves as a fulcrum support for the lifting lever which raises the presser foot. The upper feed dog is raised by a lifting-spring which holds the feeddog against the end of the thrust rod.

It is obvious'that minor changes in the details of construction may be madewithout departing from the spirit of the invention as set forth in the appended'claims.

Having thus described theinvention, what l claim as new and desire to secure by yLetters-Patent, is-

1. A sewing machine comprising a .work support, a lower feed dog beneath the work support, means for raising and 1 lowering said feed dog, an upper feed-dog above the work support, means for moving said yfeed dogsback and forth, a ,presser foot at one side of the upper feed dog, a support therefor, and means for raising and lowering alternately said foot and said upper .feed dog, including a lever fulcrumedon the support for the presser foot, said .lever lying in a plane at right angles to the lineroffeed and connected at its lfree end to the upper feed dog and at its other end to an actuating part of the sewing machine.

2. A sewing machine comprising a work support, a lower lfeed dog beneaththe ,work

support, means for raising and lowering i lsaid feed dog, an upper feed dog above the work support, means for moving Lsaid ,feed dogs back and forth, a presser foot atene side of the upper feed dog, a support therefor, and means for raising andv lowering ating part of the sewingmachine, said lever being substantially horizontal and having the distance between the fulcruin on the support for .the presser foot and the actuating i :lilo alternately said foot and ,said upper feed l1-15 feed dog and at its other end to an actupart therefor, several times greater than the distance betweenthe fulcrum of the `lever and its connection to the upper feed dog.

3. A sewing machine comprising a work support, a lower feed dog beneath the work i support, means for raising and lowering said feed dog, an upper feed dog above the work support, means for moving said feed dogs back and forth, a presser foot, a sup- .rrt therefor, mea-11S fermiers @dieser Ving alternately said presser foot and said 4. A sewing machine comprising a work support, a lower-feed dog beneath the work support, means for raising and lowering said feed dog,an upper feed dog above the work support, `means for moving said feed dogs back and forth, a presser foot, a support therefor, means for raising and lowering feed dog including a lever adapted to fulalternately said presser foot and said upper feed dog, including a lever fulcrumed on the support for the presser foot, said lever carrying at its free entf an adjustable head having a recess therein, said upper feed dog carrying a block having a recess in its upper face, a thrust rod engaging at its opposite ends said respective recesses, a Vlifting spring for connecting the upper feed dog to the free end of the lever, and means for oscillating the lever, said lifting spring being coiled about said thrust rod and supporting said rod in alinement with the recesses.

5. A sewing machine comprising a work support, a lower feed dog beneath the work support,-means n for raising and lowering said feed dog, an upper feed rdog above the work support, means for moving said feed dogs back and forth, apresser foot at one side of the upper feed dog, a supportv therefor, means for raising and lowering alternately said presser foot and said upper Crum on the feed dog for lifting the presser foot andto fulcrum on the presser foot for Ylifting vthe feed dog,'said lever lying in a plane at right angles to the line of feed, and means connected to the lever at its outer end and to an actuating part of the sewing machine for oscillating said lever, the'distance between the connection of the actuating means to ythe lever and the fulcrum on the presser foot being many times greater than the distance between the fulcrums, whereby the raising or lowering of the presser footjand upper feed dog through varying thicknesses of material passing beneath the same, does not change the relative positions of the presser foot and upper feed dog.

6. A sewing machine comprising a work support, a lower feed dog beneath the work support, means for raising and lowering said feed dog, an upper feed dog above the work support, means for moving saidV feed dogs back and forth, a presser foot at one 'side of the upper feed dog, a support therethe lever for oscillating thesame, said lever lying in a plane at right angles to the line of feed and connected at vits outer kend to an actuating part ofthe sewing machine.

In testimony whereof, I aiiiX my signature.

JOSEPH BERGER.

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