US1197735A - Overseaming sewing-machine. - Google Patents

Description

A. GRIEB.

OVERSEAMING SEWING MACHINE.

APPLICATION FILED 0012,1914.

1,197,735. v PatentedSept. 12,1916.

2 SHEETS-SHEET I.

WITNESSES: mafia 4 73M BY ATTfi/itfi A. GRIEB.

OVERSEAMING sewmc MACHINE.

APPLICATION FILED OCT. 2. I914.

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ALFRED GRIEB, 0F ELIZABETH, NEW JERSEY, ASSIGNOR TO THE SINGER MANUFAC- TUBING COMPANY, A CORPORATION OF NEW JERSEY.

OVERSEAMING SEWING-MACHINE.

Specification of Letters Patent. Patented Sept. 12, 1916..

Application filed October 2, 1914. Serial No. 864,567.

To all whom it may concern:

Be it known that I, ALFRED GRIEB, a citizen of the United States, residing at Elizabeth, in the county of Union and State of New Jersey, have invented certain new and useful Improvements in Overseaming Sewing-Machines, of which the following is a specification, reference being had therein to the accompanying drawings.

This'invention relates to improvements in sewing machines, and has for its object to provide a compact and efficient machine for overseaming or cross stitching, particularly adapted for securing wire binding upon hats and for purposes of like character.

In its present embodiment the machine employs stitch-forming mechanism adapted to manipulate a single thread, the needle-bar and looper being given lateral movements at right angles to the movement of the feed simultaneously with the action of the latter. The needle-bar is mounted to reciprocate in a swinging frame, and the looper is carried bya slidingsection of the main or driving shaft which is journaled in bearing supports rising from the bed-plate of the machine. Feed actuating and feedlift eccentrics are mounted upon the driving shaft, the shaft carrying also a gear which meshes with the gear of a cam-wheel, the latter being employed to operate a segmentlever adjustably connected to a rocker having direct link connections with a sleeve or bushing embracing the sliding looper-carrying section of the driving shaft and with the swinging needle-bar frame. The feeddog is carried by a feed-bar of usual construction, and feed ,actuating and feed-lift rockers pivotally support said bar respectively at the rear and forward ends thereof. Parallel bearing supports risingfrom the bed-plate ail'ord supporting members common to both rockers; and the rockers are operated from the driving shaft at a point intermediate said bearing supports by two rcciprocatory members.

In the d awings, Figure 1, is a perspective view from the front of a machine embodying the improvements. Fig. 2 is a view in detail of the sectional driving and loopercarrying shaft, together with the sleeve which embraces the sliding section thereof and supports the throat-plate. Fig. 3 is a perspective view of the improvements from the rear of the machine, the frame of the latter being indicated partly by dotted lines. Fig. 4 is a perspective view partly in section of the driving shaft and the feed-lift mechanism connected therewith.

The machine comprises the bed-plate A, standard B and overhanging arm C. Rising from the bed-plate. are the bearing sup- 1 guide-arm (Z which is disposed intermediate a boss on the head of the overhang ng arm and an overhangingclip c secured thereon.

Mounted to reciprocate vertically within bearing apertures formed in the swinging frame 5 is a needle-bar 6 carrying the eyepointed needle 7. Clamped upon the needlebar by means of the screw 8 is the split hub 9 of a short arm 10 pivotally connected at 11 to a link 12 carried at the end of the vibrating arm 13 which is fulcrumed at 14 upon the overhanging arm C and which is operatively connected 'by the pitman 15 with an actuating crank or eccentric upon the driving-shaft 2. The projecting bosses 0* on the head of the overhanging arm are provided with apertures to receive the presserbar 16, the latter carrying the presser-foot 17 and being provided with an arm 18 which receives the pressure of a flat-spring 19, the latter acting to lower the Presser-foot upon the material when the presser-bar is released by the lifting-lever 20.

As hereinbefore stated, the driving shaft 2 is sectional; its extreme end section 2 being formed with an axial aperture 21 to receive the rearwardly projecting stud 22 of the looper 23, the looper being held in place by means of a set-screw 2% which engages the fiat face of stud 22, thereby holding the same against both turning and endwise of section 2 is formed with a transverse rib or lug 27 and with a stud 28, and the rib and stud fit within a suitable apertured seat 29 formed in the end of section 2", the flattened face 28* of stud 28 being engaged by a clamp-screw 30 which serves to hold section 2 rigidly secured to section 2 in such manner that the sleeve or bushing 25 is confined against endwise movement relative to the shaft. The end of shaft section 2* opposite stud 28 is formed with a slot 31 to receive the reduced flattened or keyed end 32 of the main driving section of shaft 2. It will be seen that the construction thus described permits the rigidly connected sections 2" and 2 to mo ve endwise relatively to the main section 2simultaneously with their rotary movement with said main-section.

The sleeve or bushing 25 is provided with an aperture 33 in line with the clampingscrew 24, so that the said screw may be loosened to permit removal and replacement of the looper without removing the sleeve from the section 2". A second aperture 34 is formed in the sleeve 2 in line with clamping-screw 30 inasmuch as the section 2 must be secured to section 2 after the sleeve is in place.

From the foregoing it will be seen that the needle-bar and looper are capable of bodily movements at right angles to the line of feed. To produce such movements, an actuating member common to both the needle-bar and looper and capable of wide changes in the extent of its operative movements, isemployed. The said actuating member comprises a triple-armed rocker 35 formed ,with a hub to receive the studscrew 35 which is held within the projecting boss I) of the standard B. The depending arm 36 of the rocker is pivotally connected by means of the stud-screw 37 to one end. of a link 38 having its opposite end apertured to receive the stud-screw 39, the latter entering the threaded-aperture 40 of a transverse lug 25 formed integrally with the sleeve 25 and partially overhanging section 2 of the driving shaft. The lug 25* is formed with an apertured seat 41 to receive a narrow throat-plate 42, the latter being held in place by means of the screw 43. In practice, the throat-plate slides within a channel formed in the upper face of bearing support 1*, the side walls of the channel holding the plate against lateral movement and thereby preventing oscillatory movement of the sleeve 25.

Tothe upwardly extending arm 36 of the rocker 35 is pivotally secured by means of the stud-screw 44, one end of a link 45 having its opposite end formed with a hub 46 to receive the shouldered adjusting bolt 47 supporting at its end a T-shaped stud to fit within the correspondingly formed groove 48 of a segment lever 49 fulcruined at 50 upon the standard B and provided with a depending extension 51 carrying a roller-stud 52 fitted within the cam-groove 53 of the cam-wheel 54, mounted upon a stud s which has a shank 8' arranged eccentric thereto and held within a boss projecting from the standard B. By turning the stud 8 the distance between the camwheel and its driving gear may be adjusted to compensate for wear. The gear 54 of cam-wheel 54 meshes with a gear 55 on the driving shaft 2, whereby motion. is transmitted from the driving shaft to the segment lever 49 and, through the aforesaid rocker and link connections, to the sliding sections 2 and 2 of the driving shaft and also to the swinging needle-bar frame in the manner now to be described,

Projecting laterally from the frame 5 is a lug (50 supporting a stud-screw 61' which is embraced by a transverse collar 62 atone end of a link 63, the bent opposite end of the link being pivotally connected at 64 to the upwardly extending rocker-arm 65. It will be noted that the fulcrum point 4 of the needle-bar frame is located below the connecting point 61, of the said frame and the link 63. Hence when the rocker-arm 36 is swung toward the left or right to impart a lateral movement to the looper, the reverse movement of rocker-arm 65 and, the upper portion of the needle-bar frame will move the needle laterally a corresponding distance inaccord with the looper. By moving the end of link 45 toward and from the axis of movement of the segment lever 49 an adjustment will be made in the lateral move ment of both the needle-oar and the looper, as will be understood without further explanation.

The shank. of the feed-dog 66 fits within a channel (57* formed in the feed-bar 67, being rigidly secured to the bar by means of a fastening screw 66*. The opposite end of the feedbar is formed with a hub 68 which fits upon the upper shaft 69 of a feed-actuating rocker 70. The rocker 70 is disposed intermediate parallel bearing supports a and (1 rising from the bed-plate A and provided with bearing apertures to receive the rock-- shaft 71 upon which the rocker 70 is mounted. An arm 72 projecting upwardly from the rocker 70 is formed with a segmental slot to receive the stud-bolt 73 carried at one end of a feed-actuating eccentric rod 74 provided with a strap 75 embracing an cecentric 76 on. the driving shaft 2.

The feed lifting mechanism comprises a rock-shaft 77 journaled in the bearing supports a and a and having securely clamped thereon by means of screw-7 8 the split and apertured end of a crank-arm 79 pivotally connected at 80 to the lower end of a link 81, the upper end of the link being formed with rod 86, the strap 86* of the latter embracing I the eccentric 87 upon the driving shaft 2.

It will thus be seen that the feed-rockers operate above the bed-plate A upon rockshafts mounted in bearing supports common to both, that the operative connections between the rocker and the driving shaft are disposed intermediatethe said bearing supports, and that the feed-bar is supported at its end adjacent the feed-dog by the feedlift rocker members. This arrangement provides adequate supporting means for the feed-bar and feed-rockers, relieving the latter from twist when heavy pressure is imposed upon the feed-dog, and protecting the actuating pitmen and eccentrics from undue wear.

It will be understood that various changes may be made in the embodiment of the imlooper, an axially movable looper shaft and a supporting bushing adapted to slide therewith, a throat-plate carried by said bushing and mounted in the frame to hold the bushing against oscillatory movement, a rocking element, and link connections between said rocking element, the needle-bar frame and the bushing.

2. In a sewing machine, the combination with a frame including a supporting arm, of a swinging needle-bar frame formed with a lateral hub, a fulcrum stud on said arm entering said hub, a needle-bar, a looper, a driving shaft journaled in the frame below said supporting arm and formed with an axially movable looper-carrying section, a bushing embracing said looper-carrying shaft-section and slidingly movable therewith, a rocker having a single fulcrum point on the frame and provided with direct link connections with the needle-bar frame and the bushing, and a segment lever operatively connected with said shaft and provided with an adjustable link connection with the rocker.

3. In a sewing machine, the combination with a frame including a supporting arm, a needle-bar frame provided with a fulcrum upon said arm, a needle-bar and means for reciprocating the same, a sectional driving shaft journaled in the frame below the overhanging arm, the end of one section thereof being formed with a key to engage the opposed walls of a slot formed in the other section, a looper carried by one shaft-section, a sliding bushing surrounding and held against endwise movement relative to said looper carrying shaft-section and forming a supporting bearing therefor, arocker, a link directly connecting said rocker with the needle-bar frame above its fulcrum point, and a link directly connecting the rocker with the said sliding bushing.

4. In a sewing machine, the combination with a frame including a bed-plate and an arm overhanging the same, of a needle-bar frame mounted for lateral movement on said arm, a looper, a driving shaft journaled in the frame below the overhanging arm and formed with a sliding section carrying the looper, means for simultaneously imparting axial movement to said sliding shaft-section and lateral movement to the needle-bar frame, a feed-bar carrying a feed-dog, feed actuating and feed-lift rockers pivotally supporting said feed-bar, respectively at the rear and forward ends thereof, parallel bearing supports rising above the bed-plate and affording common supporting members for the feed-rockers, and reciprocatory actuating members connecting the driving shaft and the feed-rockers intermediate said hearing supports.

5. In a sewing machine, the combination with a frame including a supporting arm, of a needle-bar frame mounted for lateral movement upon. said arm, a needle-bar, a looper having a rearward stud, a driving shaft journaled in the frame and comprising a forward section formed at one end with an annular flange and with an axial aperture to receive the looper-stud, and at its opposite end formed with an axial aperture and a transverse channeled seat, a sleeve fitted upon the forward shaft section and abutting the annular flange thereon, an intermediate shaft section formed in one end with a slot and at its opposite end with a transverse lug and a projecting stud to fit the apertured channeled end of the forward shaft section and adapted to confine the sleeve thereon, a rear shaft section having a keyed end to enter the slot in the intermediate section, a rocker o eratively connected with the needle-bar f i'ame and with the said sleeve, and an operative connection between the driving, shaft and said rocker.

6. In a sewing machine, the combination with a frame including a bedplate and an overhanging arm supported y an upright standard, a needle-bar frame mounted for lateral movement upon the overhanging arm, a needle-bar and means to reciprocate the same, a looper, a driving shaft including a looper-support slidingly mounted below' the overhanging arm, a grooved cam-wheel operatively connected with the driving shaft, a segment-lever mounted upon the standard and operatively engaged'by said cam-wheel, a rocker comprising reversely movable arms having a transverse axial support upon the standard adjacent the segment-lever, an adjustable link connecting the rocker and lever, and link connections between the rocker-arms, the, needle-bar frame and said sliding looper-support.

7. In a sewing machine, the combination with a laterally vibrating needle and means for actuating the same, a looper driving shaft, a looper carried thereby, a support, a bushing slidable in said support and forming a bearing for said shaft, means for holding said shaft against endwise movement relative to said bushing, a throatplate secured to said bushing and movable therewith, and means for imparting endwise movement to said bushing in unison with said laterally vibrating needle.

8. In a sewing machine, the combination with a frame, of a driving shaft journaled therein and comprising a main section and an endwise movable looper-carrying section coupled to rotate in unison, a looper mounted upon the latter, means for imparting axial movements to said looper-carrying shaft-section, a feed-bar disposed adjacent to said looper-carrying shaft-section and carrying a feed-dog, feed-actuating and and independent operative connections between said rockers and said .main shaftsection. i

9. In a sewing machine, the combination with a frame, of a looper-driving shaft journaled therein and comprising a main section andan endwise movable section coupled to rotate in unison, a looper driven from one of said sections, a bearing stud upon said frame, a cam mounted on said stud for imparting to said looper axial movements, a driving connection between said looper driving shaft and said cam, and means for adjusting the relative pdsitions of-said looper-driving shaft and the camsustaining portion of said stud.

10. In a sewing machine, the combination with a frame, of a looper-driving shaft journaled therein and comprising a main section and an endwise movable section coupled to rotate in unison, a looper driven from one of said sections, a bearing stud having an eccentric shank portion adjustably mounted in the frame, a cam mounted upon said stud for imparting axial movements to said looper, a driven gear secured to said cam, and a driving gear carried by said driving shaft and meshing with said driven gear.

In testimony whereof, I have signed my name to this specification, in the presence of two subscribing witnesses.

' ALFRED GEIEB.

Witnesses l t. LEE Hnmrs, H. A. KonNnMANN,

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