US1890075A - Sewing machine work-support - Google Patents

Description

F. M. CARD Dean 6, 1932.

SEWING MACHINE WORK SUPPORT Original Filed May 28, 1950 I INVENTOR. @?14. 6 BYJ- A TTORNE Patented Dec. 6, 1932 UNITED STATES PATENT OFFICE FREDERIG M. CARD, 0F BBIDGEPORT, CONNECTICUT, ASSIGNOR TO THE SINGER MANU- FACTURING COMPANY, OF ELIZABETH, JERSEY, A CORPORATION OF NEW JERSEY SEWING MACHINE WORK-SUPPORT Original application filed May 28, 1930, Serial No. 456,380. Divided and this application filed July 16,

This invention relates to improvements in sewing machine work-supports and has for its primary object to provide, in a simple manner, work-supporting means which will minimize distortion of the work resulting from the anchoring of the seam-forming stitches, and which will also serve to assist in the control of the thread-chain when chaining-ofi between successively stitched articles. A further object of the invention is to provide an improved fabric-margin supporting device in a sewing machine adapted to join abutted or slightly overlapping fabric-margins.

The foregoing and other objects and advantages in view, together with means whereby the same may be carried into efiect, will best be understood from the following description of a preferred embodiment of the invention illustrated in the accompanying drawing, in which:

Fig. 1 is a top plan view, partly in section, of the work-support, presser-foot and trlmming mechanism of a sewing machine containing a preferred embodiment of the invention. Fig. 2- is a sectional view of the worksupporting and feeding means, together with a side elevation, partly in section, of the presser-foot. Fig. 3 is a top plan view of the throat-plate and of the improved fabricmargin supporting member applied thereto. Fig. 4 is a top plan view of the resser-foot shoes.

As described in my prior patent application Serial No. 456,380, filed May 28, 1930, of which this application is a division, the invention is illustrated as embodied in a sewing machine having a work-supporting post 1, upon the upper end of which a throatplate 2 is secured by the screws 3. The throat-plate has a plurality of feed- slots 4 and 4 for feed- dogs 5 and 6, and a transverse needle-slot 7 for a vertically reciprocatory and laterally vibratory needle 8. The rear wall of the needle-slot is partly cut away to Serial No. 551,113.

provide a generally V-shaped thread-clearance recess or depression 9 in the upper face of the throat-plate, which depression is inclined downwardly toward the needle-slot 7 from its pointed end remote from said needle-slot.

Disposed in spaced relation above said recess 9 is a chaining-off finger 10, extending across the needle-slot 7 and having its upper surface preferably substantially flush with the upper face of the throat-plate, the under side of said finger being inclined upwardly toward its pointed free end terminating rearwardly of the path of the needle 8. The chaining-0E finger 10 is preferably formed integral with a ridged fabric-margin supporting member 11, whose crest 12 is disposed centrally of and parallel with the line of scam formation and terminates in advance of the needle-slot 7 in a downwardly inclined surface 13 merging into the upper face of the chaining-01f finger. The member 11 is removably disposed in a recess 14 formed in the upper face of the throat-plate in front of the needle-slot and between the adjacent front feed- slots 4 and 4, said member being secured to the throat-plate by screws 15.

The feed-dog 5 operates through the feedslots 4, and the feed-dog 6 through the feedslot 4 and the front end of the feed-slot 4 adjacent to said slot 4, as will be more clear- 1y understood from a more complete disclosure of the feeding mechanism in my before mentioned prior patent application Serial No. 456,380. The feed-dogs are preferably capable of difierential work-advancing movements, whereby the margin of a body material atone side of the margin-supporting member 11 may, if desired, be advanced faster than the margin of the body material disposed at the opposite side of said member.

Yieldingly opposed to the feed-dogs is a presser-foot including adjacent foot-plates or shoes 16 and 17 preferably capable of yielding vertically independently of each 'downwardly underneath the presser-foot.

other and of a chain-controlling or auxiliary foot 18 disposed between the heels of the foot-plates 16, 17 and directly rearwardly of the needle-path. The foot-plates 16 and 17 are spaced from each other beginning from the upturned toes thereof to provide a fabricmargin receiving slot 19 which terminates at a point directly in front of the needle-path, at which point the adjacent edges of the footplates curve inwardly into abutting relation, whereby the fabric margins are directed The presser-foot is preferably so disposed with respect to the throat-plate that the crest 12 of the fabric-margin supporting member rises substantially centrally of the presserfoot slot 19.

i The fabric-margins upturned in the press? er-foot slot 19 are preferably trimmedcby a.

mechanism including a horizontally disposed ledger-blade 20 and'a horizontally vibratory cutting blade 21, of which the latter may be vibrated by any suitable mechanism. The trimmer-blades are disposed in recessed guard- blocks 22 and 23 secured upon the footplates 16-and 17, said guard-blocks together providing a diverting surface 24 for initially deflecting the trimmed-off margins away from the needle-path andto a diverter-blade 25 which completes the deflection of said trimmed-0E margins. The diverter-blade is so supported that it may be swung into and out of operative position, being illustrated in its throw-out position in Fig. 1 of the drawit will be understood from the foregoing description that'in the present machine the fabric-margins, which are upturned in the slot 19 between the presser-foot plates 16, 17, are supported by the ridged member 11 as said margins are advanced by the feeddogs 5 and 6 to trimming position. After being trimmed,the body-material margins are directed downwardly by the presser-foot along the inclined surface 13 of saidmemher into abutting or slightly" overlapping relationship upon the wider portion or base of the chain ng-off finger 10, where'the laterally vibrating needle alternately penetrates the adjacent fabric-margins and in cooperation with any suitable loop-taker mechanism unites saidadjacent margins by zigzag stitches. Inasmuch as the stitches embrace the finger 10, which constitutes a continuation of the crested or ridged member 11, there is a minimum of tendency to distortthe fabricmargins by the setting of the stitches, which latter are free to slide'oif the tapered finger lOby the provision of the throat-plate depression 9 below said finger. ihe present construction furthermore provides for chaining-off, the thread-chain being controlled by the auxiliary foot'18 and ing-ofi' finger and bydetachably securing said member upon the throat-plate, the process of manufacture is materially simplified and the cost of construction and replacement is materially reduced.

Having thus set forth the nature of the invention, what I claim herein is 1. In a sewing machine, in combination, stitch-forming mechanism including a reciprocatory needle, feeding mechanism, a throat-plate, presser means opposed to the throat-plate having spaced work-engaging toes between which upturned margins of material are adapted to pass toward the stitching point, a ridged fabric-margin supporting member having a crest which extends lengthwise and substantially centrally 0f the line of seam within the space between said toes, and terminates in a chaining-01f finger, and means for detachably securing said fabric-margin supporting member upon the throat-plate with its crest above the upper surface of the throat-plate and its chainingolf finger projecting rearwardly beyond the path of the needle. a

2. In a sewing machine, in combination, stitch-forming mechanism including a reciprocatory needle, feeding mechanism, a throat-plate having a needle-slot elongated crosswise of the line of seam formation and integral with said member, and means for 1 detachably securing the fabric-margin supporting member upon" the throat-plate with its chaining-off finger overlying said throatplate recess in spaced relation thereto.

In testimony whereof I have signed my name to this specification. I

FREDERIO. M. CAB-D.

a section of the feed-dog 1 opposed thereto.

By providing the member 11 withthe chain-

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