US2028005A - Sewing machine - Google Patents

Description

Jan. 14, 1936. H. c. NISSEN SEWING MACHINE Filed April 27, 1935 2 Sheets- Sheet 1 swam Com mums Jan. M, if H. c. NISSEN SEWING MACHINE Filed April 27, 1935 2 Sheets-Sheet 2 mar" M1 [Visa e-ml Patented Jan. 14, 1936 PATENT OFFICE SEWING MACHINE Henry C. Nissen, Stratford, Conn assignor to The Singer Manufacturing Company, Elizabeth, N. J a corporation of New Jersey Application April 27, 1935, Serial No. 18,519

Claims. (01. 112-427) This invention relates to improvements in edge-guiding devices for use in connection with trimmer mechanisms for sewing machines, and more particularly with underedge trimmers of 5 the horizontally vibratory or so-called Barber type.

It is the primary object of the present invention to provide means for conveniently handling the work during stitching operations requiring the employment of a trimmer mechanism and an edge-guide, either separately or in combination.

With the above and other objects in view, as will hereinafter appear, the invention comprises 5 the devices, combinations and arrangements of parts hereinafter set forth and illustrated in the accompanying drawings of a preferred embodiment of the invention, from which the several features of the invention and the advantages attained thereby will be readily understood by those skilled in the art.

In the drawings, Fig. 1 is a view, partly in front elevation and partly in section, of a portion of a sewing machine containing a preferred embodiment of the invention. Fig. 2 represents a vertical section, substantially on the line 2-2 of Fig. 1, illustrating the trimmer actuating mechanism. Fig. 3 represents a vertical section, substantially on the line 3-3 of Fig. 1, illustrating the trimmer and edge-guide coupling device. Fig. 4 is a top plan view of a portion of the sewing machine cloth-plate, illustrating both the trimmer-knife and the edge-guide in full lines in their operative position, and in dotted lines in their inoperative position. Fig. 5 is a top plan view similar to Fig. 4, but with the trimmer-knife in its operative position and the edge-guide swung into its inoperative position.

As illustrated in the drawings, the sewing machine has a bed-plate I upon which is suitably secured a throat-plate 2 provided with a feedslot 3 and a needle-aperture 4. Adjacent to the needle-aperture 4, the throat-plate is recessed to provide an arcuate wall 5'.

Operating through the throat-plate feed-slot 3 is a feed-dog 6 opposed by the usual presserroller 1, the stitching being effected by a needle 8, carried by a vertically reciprocatory needlebar 9 and cooperating with a suitable looptaker (not shown).

The trimmer mechanism illustrated in the drawings corresponds substantially with the disclosure in the U. S. patent to F. M. Card, No. 1,963,933, June 19, 1934. In general, this mechanism comprises a supporting plate [0, suitably secured upon the bed-plate I and upon which a knife-driving lever ll is pivotally secured by a screw l2 for horizontal swinging movements. Pivotally depending from the driving lever II and extending through a slot H3 in the bed-plate 5 E is a yolk-member l4 providing a guideway for a slide-block l5. The slide-block I5 is pivotally secured by a screw l6 upon the upper end of a crank-arm ll carried by a horizontally disposed rock-shaft I8 journaled in a bearing 10 bracket l9 depending from the bed-plate I. Suitably clamped upon the rock-shaft I8 is a forked arm 20 engaged by a cam 2| carried by the usual rotary loop-taker actuating shaft 22.

Pivotally secured by a screw 23 upon the driv- 5 ing lever it, for swing-out movements about a vertical axis, is a knife-carrying lever 24 upon which the slotted shank of a trimmer knife 25 is adjustably secured in a suitable manner, said knife having the usual vertically depending fin 20 26 slidingly engaging the arcuate wall 5 of the throat-plate recess. The tail end of the knifecarrying lever 2i is adapted to resiliently engage an upwardly open notch 21 provided in an angular plate 28 adjustably secured by a screw 29 25 upon the knife-driving lever H. When the knife-carrying lever 24 is seated in the notch 21, said lever 2 is anchored to the driving lever II for horizontal vibration therewith. However, by reason of the resilience of the tail of the so knife-carrying lever 24, it may be readily lifted out of the notch 21, whereupon the lever 24 may be swung horizontally about its fulcrum-axis 23 to carry the knife 25 into an inoperative position, as illustrated by dotted lines in; Fig. 4 of the 35 drawings.

lhe improved edge-guiding device is mounted upon an angular supporting bracket having its base 38 secured by a screw 3| upon the trimmersupporting plate it! for adjustment crosswise of 40 the line of seam formation. Rising from the bracket-base 30 is an upstanding wall 32 bent laterally to provide a horizontally disposed supporting member 33 overhanging the fulcrumaxes of the knife-driving and knife-carrying 45 levers.

A two- armed lever 34, 35 is pivotally secured upon the bracket-member 33, by means of a pivot-bolt 36 which is preferably in vertical alinement with or, closely adjacent to the ful- 50 crum-axis of the knife-carrying lever 24. The arm 341 of said lever overhangs the trimmerknife 25 and is bent downwardly into close proximity to said knife, the free end of said arm 34 serving as an edge-guide for the work.

Threaded into the arm of the edge-guide, lever is a bushing 31 having its head provided with a diametral groove 38. Vertically slidable in the bushing 31 is a shouldered plunger 39 from which laterally extends a pin 40 adapted to enter the groove 38 of the bushing. The reduced lower end 4| of the plunger is adapted to enter a slot 42 provided in the knife-lever 24, a spring 43 housed by the bushing 31 urging the plunger yieldingly downwardly. The knifelever slot 42 and the plunger end are so proportioned as to provide sufficient clearance permitting normal operation of the trimmerknife to sever the work without actuation of the edge-guide. However, when the knife-lever 24 is disengaged from the driving lever H, i. e., when the tail end of the lever is lifted out of the notch 21, and is shifted into an inoperative position as illustrated by dotted lines in Fig.4 of the drawings, the edge- guide lever 34, 35 is also swung into an inoperative position by the coupling connection between the plunger 39, M and said knife-lever.

By slightly lifting the plunger 39, against the action of the spring 43, and turning said plunger about its longitudinal axis, so that the pin 40 is disposed transversely of the bushing groove 38, (Fig. 5) the plunger-end 4| is withdrawn from the knife-lever slot 42. The knifelever and the edge-guide may now be swung into inoperative positions independently of each other, so that either the knife or the edge-guide may be employed separately or in combination, according to the nature of the work.

In order to provide for conveniently shifting the edge- guide lever 34, 35 into and out of operative position, said lever is preferably provided with an operating handle 44 and with a horizontally-disposed segmental arm 45 provided in a side edge thereof with spaced stopnotches 46 and 41. Secured by screws 48 upon the wall 32 of the edge-guide bracket isaspring 49 bent to provide a V-shaped detent 50 adapted to yieldingly enter the stop- notches 45, 41 in the arm 45, to definitely locate the operative and inoperative positions of the edge-guide and to normally hold the edge-guide in said positions.

Having thus set forth the nature of the invention, what I claim herein is:--

1. In a sewing machine, in combination, stitch-forming mechanism, trimmer mechanism including a work-severing knife adapted to be shifted into and out of operative position, an edge-guide for directing work past said stitchforming mechanism, edge-guide supporting means providing for shifting said edge-guide into'and out of operative position relatively to said knife, and means for releasably coupling said edge-guide and knife for simultaneous movement thereof out of operative position.

2. In a sewing machine, in combination, stitch-forming mechanism including a vertically reciprocatory needle, trimmer mechanism in-- cluding a horizontally vibratory knife adapted to be swung about its fulcrum-axis into and out of an operative position adjacent to said needle, an edge-guide for directing work past said stitchforming mechanism, and releasable coupling means connecting said knife and edge-guide for simultaneous movement out of operative position, said coupling means providing for opera.- tive work-trimming movements of said knife in a stationary operative position of said edgeguide.

3. In a sewing machine, in combination, stitch-forming mechanism including a vertically reciprocatory needle, trimmer mechanism including a horizontally vibratory knife adapted to be swung about its fulcrum-axis into and out of operative position, and edge-guide for directing work past said stitch-forming mechanism, edge-guide supporting means providing for swinging said edge-guide into and out of operative position about a pivotal axis substantially coincident with the fulcrum-axis of said knife, 5

and a releasable coupling connecting said knife and edge-guide.

4. In a sewing machine, in combination, stitch-forming mechanism, trimmer mechanism including a vibratory knife adapted to be swung about a fulcrum-axis into and out of operative position, an edge-guide for directing work past said stitch-forming mechanism, and supporting means providing for swinging said edge-guide relatively to said knife about a pivotal axis substantially coincident with the fulcrum-axis of said knife.

5. In a sewing machine, in combination, stitch-forming mechanism including a vertically reciprocatory needle, a horizontally vibratory trimmer-knife carrier, a trimmer-knife actuating lever pivotally supporting said carrier for swinging movements into and out of operative position, a releasable connection between said carrier and lever, an edge-guide, a bracket pivotally supporting said edge-guide for swinging movements relatively to said carrier, and a releasable coupling connecting said edge-guide and knife-carrier.

HENRY C. NISSEN.

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