US1016488A - Overseaming sewing-machine. - Google Patents

Description

A. GRIEB. OVERSEAMING SEWING MACHINE.

APPLIOATION FILED JUNE 28, 1910. y

Patented Feb. 6,' 1912.

2 SHEETS-SHEET l.

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A. GRIEB. OVERSEAMING SEWING MACHINE. APPLICATION FILED 11111228, 1910.

1,016,488. Y Panentea'Feb. 6, 1912.

2 SHEETS-SHEET 2 UNITED STATES 'PATENT OFFICE.

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

OVERSEAMING SEWIN G-MACI-IIN E.

Specification of Letters Patent.

To all whom t may concern.'

Beit known that I, ALFRED GRIEB, a citizen of the United States, residing at- Elizabeth, in the county of VUnion 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 A the accompanying drawings.

This invention has for its object to provide a simple and effective overseaming stitch-forming mechanism of that class comprising a needle and loop-takers seizing needle-thread loops upon one side of the work and presenting loops for passage of the needle at the opposite side of the work.

The present improvement constitutes a specific form of the invention forming the subject of my United States Patent N o. 931,058, dated August 17, 1909, and comprises a reciprocating needle and two loopers or thread-carriers either or both of which may be provided with an eye to receive a looper-thread or may be formed with an open hook so as to merely pass one thread loop through another.

In its present embodiment, the invention includes an eyed looper mounted upon a fixed fulcrum and adapted to seize a loop from the needle and to present a loop of its own thread to a non-thread-carrying looper or spreader operatively connected therewith and mounted upon a movable fulcrum and actuated to present a loop of looper-thread for passage of the needle in its succeeding reciprocation. The two loopers have differential movements in parallel planes inclined to the needle path.

The invention will be understood by reference to the annexed drawings, in which- Figure 1 is a front side elevation of a sewing machine embodying the present improvements with the work-plate in section, Fig. 2 a front end view of the same with the work-plate in section and the face-plate of the head of the bracket-arm removed, and Figs. 3 and 4 are perspective views showing the stitch-forming mechanism in different positions.

The machine comprises the frame including the base 1 from the rearward portion of which rises the standard 2 carrying the overhanging arm 3 with the head 4. The base is provided at the forward portion with the bearing member 5 formed with a seat upon which is secured the work-plate 6.

Journaled in the base is the longitudinally extending main-shaft 7 provided at the rearward end with the grooved beltpulley 8 and balance-wheel 9 carrying the crank-pin 10 embraced by one end of the pitman l1 whose opposite end is connected with the crank-arm 12 of the needle-actuating rock-shaft 13 whose forward end is provided with the crank-arm 14 connected by means of the link 15 with a lateral stud upon the collar 16 fixed upon the vertically reciprocating needle-bar 17 j ournaled in the head 4 and carrying the needle-clamp 18 in which is secured the eye-pointed needle 19. The main-shaft 7 is provided with the ball-crank 20 embraced by the strap 21 of a `pitman 22 connected with a stud 23 upon Ethe rearwardly extending arm 24 of a flooper-actuating rock-lever mounted upon the fulcrum-stud 25 tapped in the base 1 and having a forwardly extending arm 26 which carries the fulcrum-stud 27 upon which is gmounted the looper-lever 28 provided with the hooked or non-thread-carrying looper- `blade 29 formed at its extremity with the depending barb 29".

Mounted upon the xed fulcrum-stud 30 `carried by the rigid forwardly extending arm 31 of the bearing member 5 is the boss 32 of the vibrating looper-lever 33 formed at its outer or free end with the angularly `disposed looper-blade 34 having the loopseizing point or beak 35 and adjacent thread-eye 36 and the thread-eye 37 near its heel. Between the thread-eyes 36 and 37 the looper-blade 34 is bowed laterally toward the plane of movement of the looperblade 29 to form a lateral needle-clearance recess 34X to enable the point of the needle in descending to enter the space between such recessed portion and the thread extending from the looper-eye 36 to the edge of the work so as to insure the engagement of the looper thread by the needle at the proper time. The studs 25, 27 and 30 are arranged in parallel relation and inclined to the direction of movement of the needle-bar, and consequently the loopers 29 and 34 are adapted for movement in parallel planes inclined to the path of reciprocation of the needle 19. The looper-carrying levers 28 and 33, and hence the loopers 29 and 34, are

Patented Feb. 6, 1912.

usual presser-bar 39 surrounded by' the spring 40 interposed between the iXed collar 41 thereon and the perforated lug 42 embracing the samev and extending from a collar 43 swiveled to the lower end of the 4 adjusting screw 44 mounted in the member 4.

The bar 39 carries at its lower end the presser-foot 45 opposed to which is the feeddog 46 having the shank 47 secured upon the feed-bar 48 connected at its rearward end by means of the pin 49 with an upright arm 50 of the feed-rocker which is provided with the depending arm 5l pivotally connected with the eccentric-rod 52 whose strap 53 embraces the adjustable feed-actuating eccentric 54 upon the'main-shaft.

The feed-bar is provided with the usual forked arm 55 embracing the feed-lifting cam or eccentric 56 from which the rising and falling movements of the feed-dog are derived. Adjustably secured by means of the screw 57 in a suitable guideway of a depending lug 58X of a laterally adjustable guide-block 58 upon the frame member 5 is the stationary trimmer-blade 59 which coperates with the movable trimmer-blade 60V formed with the slot 60 entered by the fastening screw 61 by which it is adjustably secured upon the recessed seat formed in the head 62 of. the angular vibratory cutter-lever 63 rigidly secured to the transverse rock-shaft 64 mounted upon the conical-pointed bearing screws 65 which are carried by the posts 66 rising from the base 1. The cutter-lever 63 carries intermediate its ends the lateral stud 67 embraced by one end of the eccentric-rod 68 having at its opposite end the strap 69 embracing the cutter-actuating eccentric 70.

Secured upon'the rearwardly extending arm 24 of the looper-actuating rock-lever by means of the screw 71 is the foot 72 of a vibratory looper-thread take-up lever 73 having the thread-eye 74 in its upper or outer end, and movablertoward and from alinement with thread-eyes in the parallel ears 75 in the spaced members 76 of a fork at the upper end of a thread-guide arm 7 7 adjustably secured by means of the screw 78 entering a longitudinal slot 79 therein upon the vibratory cutter-lever 63.

Mounted upon one of the bearing posts 66 is a shouldered tension-stud 80 beneath which is disposed the washer 81 with lateral ears 82 each formed with a thread-eye, the stud being provided with tension-disks 83 of which the upper is pressed upon the lower by means of the spring 84 interposed between the same and the nut 85 secured upon the threaded and split upper end of the stud.

The bracket-arm head 4 has adjustably secured upon its lower bearing member by means of the screw 86 passing through a slot 87 therein the shank 88 of a forked threadguide having spaced perforated ears 89, and the needle-bar 17 has secured thereon by means of the clamp-screw 90 the split collar 91 one of whose perforated flanges is extended forwardly to form a thread-engaging finger 92 adapted to pass between the thread-guiding ears 89 to deflect the needlethread passing through the same. To the forward side of the bracket-arm 3 is applied the usual needle-thread tension comprising the disks 93 between the outer of which and the nut 94 upon the stud 95 is interposed the usual spring 96 for pressing the disks together.

In threading the machine, the needlethread o1, is led from the source of supply between the tension-disks 93, thence through the eyed take-up members 89 and downwardly to the needle-eye. The looperthread Z is led from the source of supply through one of the apertured ears 82 between the tension-disks 83, thence through the other apertured ear 82, and through one of the guide-lugs 75, the eye 74 of the takeup lever 73 and the other guide-lug 75 to the eye 37 of the looper and thence to the eye 36 adjacent the looper point.

Preparatory to the beginning of a stitchforming cycle, the parts are in the positions represented in Figs. 1, 2 and 3, the needle being raised and the 'eyed or secondary looper 34 being in its advance position at the side of the needle path so as to embrace they latter between the lateral recess in its blade and the looper-thread leading from the eye 3,6 backwardly to the edge of the fabric. As the point of the needle passes below the eye of the threaded looper, the latter recedes and the primary non-threaded looper descends and advances to extreme lower position upon the opposite side of the needle, at which time the parts assume the positions represented in Fig. 4. The primary looper then starts to recede and seizes a loop of needle-thread upon its barb, and continues its movement laterally and upwardly, during which the feed of the work takes place, and the needle-thread loop thus supported and distended is entered by the point of the secondary looper which advances to its eX- treme upper position to again present its thread to the needle which has in the meantime risen to eXtreme upper position, the non -threaded looper having cast off its needlethread loop upon the threaded looper-blade in approaching its highest position above the latters loop-presenting position. From this point the cycle of operation above described is repeated.

During the descent of the needle and recession of the secondary looper 84, the needlethread take-up arm 92 descends between the thread-guide eyes 89 so as to draw up the needle-thread in setting the previous stitch, while the looper-thread take-up arm 7 3 advances toward the guide-arm 77 to give up slack looper-thread. As the eyed secondary looper begins its advance, the looper-thread take-up arm recedes from the thread-guide arm 77, and reaches its eXtreme retracted position just as the looper completes its advance movement, thus taking up the slack looper-thread including that drawn through the tension in the retraction of the eyed looper. The thread-guide arm 77 is in practice so adjusted that its guide-eyes are somewhat below the level of the eye 74 in the take-up lever 7 3 when the latter is in its forward position, the looper 34 in extreme retracted position, and the upper knife-blade 60 lowered, so as to increase the amount of slack looper-thread normally given up by the take-up lever. When the lever 7 3 and knifeblade 60 are retracted to initial position and the looper 34 advanced to loop-presenting position, as represented in Fig. 1, the rise vof the knife-bar 63 produces a corresponding rise in the thread-guides 75, so that the mounting of the lat-ter upon the knife-bar serves to insure an increased thread-drawing action of the take-up for pulling up the eX- cess of looper-thread so as to hold the same taut for passage of the needle in its succeeding. descent.

Having thus set forth the nature of the invention, what I claim herein is l. In an overseaming sewing machine, the combination with a reciprocating needle, of thread-carriers mounted on parallel fulcra of which one is fixed arid the other is movable and both are inclined to the needle path, whereby one of said thread-carriers is adapted to take thread-loops from and the other to present thread-loops to the needle adjacent different eXtreme positions of the latter, actuating means for imparting to one of said thread-carriers both bodily and oscillating movements upon the movable fulcrum, and an operative connection between said threadcarriers whereby said actuating' means are caused to impart to the other of said threadcarriers operative movements upon the fixed fulcrum.

2. In an overseaming sewing machine, the combination with a reciprocating needle, of an eyed looper and a non-thread-carrying looper, one being adapted to seize threadloops from the needle in one position of the same and the other to take thread-loops therefrom and to present thread-loops to the needle in a different position of the latter, a fixed fulcrum upon which said eyed looper is mounted for operative movement, a movable fulcrum upon which said non-threadcarrying looper has both bodily and oscillatory movements in a plane parallel with that of the eyed looper movements, an operative connection between 'said eyed and nonthread-carrying looper whereby operative movements of the one are derived from the other, and actuating means for the nonthread-carrying looper.

3. In an overseaming sewing machine, the combination with a reciprocating needle, of a non-thread-carrying looper adapted to seize t-hread-loops from the needle, an eyed looper adapted to seize thread-loops from the non-thread-carrying looper and to present loops of its own thread for passage of t-he needle, a fixed fulcrum upon which said eyed looper is mounted for operative movement, a movable fulcrum upon which said non-thread-carrying looper has both bodily and oscillatory movements in a plane parallel with that of said eyed looper, an operative connection between said eyed and nonthread-carrying loopers whereby operative movements of the one are derived from the other, and actuating means 'for the nonthread-carrying looper.

4. In an overseaming sewing machine, the combination with a worl -support and a reciprocating needle, of a looper adapted' to present thread-loops for passage of theneedle, a ned fulcrum disposed at one side of the work-support and upon which said looper is mounted for movement in a circular path, a barbed looper adapted to seize thread-loops from the needle and present them for engagement by the first-named looper, a movable fulcrum sustained at the same side of the work-support as the xed fulcrum and upon which the barbed looper is mounted for movement in a path crossing that of the other looper and extending from theloop-seizing point upon one side of the fabric to a position at the other side of the fabric beyond the extreme loop-presenting position ofthe other looper, and means for actuating the said loopers in the production of overseam stitches.

5. In an overseaming sewing machine, the combination with a reciprocating needle, of two loopers whereby thread-loops may be respectively taken from and presented to the needle adjacent eXtreme positions of the latter, of a fixed fulcrum upon which one of said loopers is mounted, a rock-lever mounted upon a fixed fulcrum, means for imparting rocking movements to the same, a fulcrum for the other looper carried by said rock-lever, and a pivotal connection between said loopers.

6. In an overseaming sewing machine, the combination with a reciprocating needle, of

two looper-levers each carrying a looper adapted to coperate with the other looper and the needle in the production of Voverseam stitches, a fixed fulcrum for one of said looper-levers, a rock-lever mounted upon a iXed fulcrum, means orimparting rocking movements to the same, a fulcrum for the other looper-lever carried by said rock-lever, and a stud for pivotally connecting together said looper levers for cooperative movement.

"1'.y In an overseaming sewing machine, the combination with a reciprocating needle, of two loopers, one of which is eye-pointed, whereby thread-loops may be respectively taken from and presented to the needle adjacent eXtreme positions of the latter, of a fixed fulcrum upon which one of vsaid loopers is mounted, a rock-lever mounted upon a fixed fulcrum, means for imparting rocking movements to the same, a fulcrum for the other looper carried by said rock-lever, a pivotal connection between said loopers, trimming mechanism includingra vibratory knife-carrying lever, spaced thread-guiding eyes mounted upon said lever, and a looperthread take-up lever mounted upon and movable with said rock-lever and having a thread-eye movable toward and from alinement with said spaced thread-guiding eyes.

8. In an overseaming sewing machine, the combination with a reciprocating needle, of two loopers, one of which is eye-pointed, whereby thread-loops may be respectively taken from and presented to the needle adjacent eXtreme positions of the latter, of a fixed fulcrum upon which one of said loopers is mounted, a rock-lever mounted upon a fixed fulcrum, means for imparting rocking movements to the same, a fulcrum for the other looper carried by said rock-lever,l a pivotal connection between said loopers, trimming mechanism including a vibratory knife-carrying lever, a rigid arm mounted upon and transversely adjustable in the direction of vibratory movement of the knifecarrying lever and provided with spaced thread-guiding eyes, and a looper-t iread take-up lever mounted upon and movable with said rock-lever and having a threadeye movable toward and from alinement with said spaced thread-guiding eyes.

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

ALFRED GRIEB.

Witnesses HENRY J. MILLER, HENRY A. KORNEMANN.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents. Washington, D. C.

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