US129778A - Improvement in tuck-creasers - Google Patents

Description

s. P. BABCOCK.v `Tuck-Creamer.v

No. 129,778. Patented July 23, 1872.

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UNITED `SI'AJIES PATENT OFFICE. I

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- f iMPRovEMENT IN TucK-cREAsERs.

Specification forming part of Letters Patent No. 129,778, dated July 23, 1872.y

thereof, reference being had to the accompanying drawing and' to the letters -of reference marked thereon and being a part of this specij cation, in which- Figure 1 shows my improved tuck-creaser in perspective. Fig. 2 is an end elevation of the tucker-spring and slotted bridge-piece.

Fig. 3 is a vertical section of the creaser-arm', spring, and bridge-piece in the act of pinching the fabric. Fig. 4 is an inverted plan of the sliding plate, and Fig. 5 is a plan of the baseplates. i j

i Similar letters of reference indicate correspondin g parts in the several figures.

Scale: Figs. 1, 4and 5, actualsize; Figs. 2` and 3, twice actual size.

`The nature of this invention relates to an r improvement in the construction of that class of tuck-marking attachments to sewing-machines in which a series of creases is formed inthe fabric on the line onwhich it is Vto be `subsequently folded; and 'it consists in the devices, hereinafter described, employed forA A pinching the folds in the fabric, and, in connection therewith, anj adjustable pressureplate, and in the arrangement of the parts for adjusting the creasing devices, as more fully the plate B, which hasalso'a'longitudinal slot, c, through which the thumb-screw passes. rIheI foregoing parts being already known and used,

their office requires no explanation. C is a pressure-bar, of sheet metal, "slightly curved'in4 cross-section, with the convex side uppermost.

"ckt itsfront end there is secured a transverse bridge-piece, D, in the top of which there is cut a rectangular notch, d. To the rear end of the bar (l there is secured a transverse plate, E, of an L.- shape,77 and bent up forward to form a spring, to which is secured'a pressery arm, F, the extremityof which is' bentV horizontally at a right angle with the rest, so as to vcome over the end, or a little beyond the end, of the pressure-bar. on the arm, through which the needle of the machine passes, so that the needle-bar may depress said arm in its downward movement. At the other end of the plate E there is secured a spring-plate, G, extending to the front end of the pressure-plate, parallel with the near lside of the same; and to its end is secured a curved plate, G', having a beveled edge, f, turned down along its front edge, and so placed that when the spring-plate G is depressed it will come just behind the bridge-piece D of the pressure-plate. To a rearward extension of the plate G there is adj ustably secured thereto, by

means of a set-screw, g', the rear end of the spring-creaser H, the screw passing through a slot, h, inthe same into the plate G. This creaser-spring is curved down and under itself in the peculiar form shown, its rear end projecting through the slot in the part f. Just outside the part f there is secured to the under side of the spring a stud, I, which, when the spring is forced down by the arm, is forced into the slot in the bridge-piece, carrying with it the fabric, pressing it against the knife-edge or beveled part f, thereby forming the crease in the fabric.

In operating upon thick goods it may be necessary to lengthen the gripe and throw of the creasing-stud, which may be done by loosening the set-screw of the creaser-spring and moving the latter outwardly the required distance. In adj ustingthe device for tucking--that is, stitching a tuck of a given width, leaving a space, and marking the fold for the next tuck-,it becomes necessary to move the pressure-plate and all its attachments longitudinally in its guides on the gage-plate B; and to secure it in position after adjustment, without resorting to a screw and nut for the purpose, I employ the following means: first, to secure the outer part, I pivot a latch, m, to the plate B near the guide, which swings across the top of the plate `(l and under a projection, n, struck or bent back from the near end of the guide b, which clamps that part of the pressure-plate in place; secondly A tie-piece, e, is sleevedv to secure the rear end of said plate I employ a slotted plate or strip, J, and I insert a headed rivet through this strip and through the plate E and rivet it to a latch, j, lying thereon. I then strike up two bosses, k, from the surface of the plate E, over which the latch, when it is turned, will ride and thus draw up andclamp the strip against the under side of said plate E. The front end of the strip has aslot, t', to receive a stud, i', struck up from the base-plate B, so that the pressure-plate can only be moved longitudinally by releasing both latches from their respective seats.

I am well aware that in other tuck-creasers abridge-piece or ridge is used, but only to serve as an abutment against which the fabric is gathered and pressed to form the crease, while in mine the fabric is forced through its notch and pressed against an angular projection of the spring-plate G, lwhich rises up from the fabric when the pressure of :the needle-bar is withdrawn.

What I claim as my invention, and desire Vto secure by Letters Patent, is*- purpose set forth.

2. The slotted bar J, engaging with the stud Vi on the plate B, and the latch j and bosses k on the plate E, as and for the purpose set forth.

SYLVESTER P. BABCOCK.

Witnesses:

H. F. EBERTS, H. S. SPRAGUE;

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